To develop Si-Te function, it would be good if INFP and ISTJ to study statistics.Sometimes I think type with Si-Te, is the best match for executing statistical method, since their psychological functions seems to support the energy for undergoing the method. In descriptive statistics as I learnt, We are required to simplify a lot of factual information so that it can be more easily discernible.
An example would be simplifying price data in a trend line. Suppose you had a daily price data of a commodity for 10 years, that total number of data would be 365*8 plus 2*366 (bisexxtile year)=3652. The vast number of data array should not be easy to comprehend. If we want to know what the data tells us, statistically, it has to be further arrange to a trend line. The trend line can tell whether in 10 years the commodity price tend to increase, decrease. There is method to follow to obtain the trendline. You can draw a cartesian diagram with X and Y axis. Y axis can represent a the commodity price daily data and X axis can represent a time lapse. Once you put each data on the diagram, a line will be graphed. That is the trend line that we seek and can tell what the data tells us.
Isabel Brigss Myers J and P is simplified behavioral tendency that originally may vary like the data array. It somewhat resembles trend line that tells what 10 years of daily commodity price is about . What Isabel Briggs Myers find was Despite observation may vary, all of behavioral tendency of introvert perception and extrovert judging is arguably empirically judgmental, abbreviated "J". Introvert judging func and extrovert perceiving func case will behave as a perceiver that is to create perception, abbreviated "P".